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A study looked into the management of various tropical grasses for improved production, measured as dry matter yield in hundreds of pounds per acre over a 54-week study period. The management variables were height of cut (1, 3, or 6 inches), the cutting interval (1, 3, 6, or 9 weeks), and amount of nitrogen fertilizer (0, 8, 16, or 32 hundred pounds of ammonium sulfate per acre per year). Forty-eight plots were assigned in completely randomized fashion to the 48 factor-level combinations. Dry matter yields for the plots are shown in the table below (data from Richards 1965). Analyze these data and write your conclusions in a report of at most two pages.
a coin is known to be either fair corresponding i the null hypotheses h0 p12 or has heads on both sides corresponding
The mean television viewing time for Americans is 15 hours per week (Money, November 2003). Suppose a sample of 40 Americans is taken to further investigate viewing habits.
1.as the degrees of freedom become larger the difference between the t and z distributions becomesa.narrowerb.stays the
If a student is selected at random, find the probability that: The student graduated high school. The student has a low reading ability, given that the student is a high school graduate
Find the regression equation and percentage of variance and test whether the equation is significant portion of the variance.
Suppose 5.9% of certain population use public transportation to get to work. You randomly select 380 workers and ask them if they use public transportation to get to work.
a loan from a bank of 100000 is to be repaid by bob in 10 annual payments beginning 1 year from the date of the loan.
Draw the suitable distribution, and locate critical regions for α = .05. Compute test statistics (z score) for the sample.
Thirty accidents of these vans were examined, and 11 vans had rolled over. Test the claim that the proportion of rollovers exceeds.
A random sample of 28 executives gives x = 6.7 years and s = 2.4 years. Give a 99% con?dence interval for the average number of years of experience for all executives in this branch.
A standard deviation of 8 minutes before they could see doctor. Give the 99% confidence interval for average waiting time for all of patients who visit doctor.
Use the Poisson distribution to find the indicated probabilities. Currently 11 babies are born in the village of West Point (population of 760) each year.
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